Ben 10 Ultimate Alien

Power Struggle

In a final showdown that he never saw coming, Ben wrestles with an unexpected twist of fate. But first Gwen takes the team to a dimension of magic where they are forced to rely on her old enemy Charmcaster to survive. Then, Kevin volunteers to return to the Null Void prison to settle an old score. Finally, Ben gets angry when Gwen recruits Darkstar to help them defeat the most surprising enemy of all in a last stand they can't bring themselves to fight.